Machine for smoothing interior surfaces



F. H. RAUH.

MACTIINE FOR SMOOTHING INTERIOR SURFACES.

JIM-L...

APPLICATION FILED MAR. I0. I919.

Patented Dec. 23, I919.

igwwwww awwwtcyo $513 1444/ Mom s in FREDEBIC H. RfrUli, OIF SOUTHORANGE, NEW JERSEY, ASSIGNOE TO I. WISS 6a SONS COMPANY, OF NEVTARK, NEWJERSEY, A CORPORATION' 01? NEW JERSEY.

MACHINE EOE SMOOTHING INTERIOR SURFACES.

1,3295, "Zllll.

Specification of Letters Patent.

Patented Dec. 23, 1919..

Application filed March 10, 1919. Serial No. 281,834.

To [Z whom it may concern.

Be it known that I, Fnnnnluo H. RAUH, a citizen of the United States,and resident of South U ange, Essex county, New Jersey, have inventedcertain new and useful improvements in Machines for Smoothing 1n--terior Surfaces, of which the following is a specification.

My invention relates to apparatus for removing the roughnesses orexcrescences which are usually found in such articles as malleablecastings or drop forgings, for instance the bur on drop forgings; and myimprovements consist in certain novel means whereby the desired resultmay be obtained by concussion instead of by grinding or similar abradingprocesses.

To explain the principle of my invention. 1 will show how it may beapplied to the removal of bur from the inside ofl'he bow of a(hop-forged scissors blade, referring in doing to the accompanyingdrawings wherein Figure 1 is a side view of an apparatus embodying myinvention and showing several scissors blades in position to be operatedupon; Fig. 2 is an end view taken on the line of Fig. 1 looking to theright; and Fig. shows a modification for use with easily rotatablearticles. Similar parts are designated by corresponding referencenumerals in all the figures. A rotatable shaft, 1, for instance theshaft of a lathe, is provided with a chuck 2-3, clamped by the collar 41threaded on the shaft, and being adapted to grasp a spindle or arm 5 soas to hold it eccentricallv relative to the center of rotation of theshaft 1. The type of chuck shown is suitable for this purpose; but otherwell known forms or chuck might be employed.

The spindle-arm 5 is provided with annular conformations suitable tocoiiperate most advantageously with the shape of the article to beoperated upon. In the present instance 1 have shown a series ofcircumferential grooves 6, 6, separated by rounded beads 7, 7, which isan arrangement admirablv adapted to operate upon the transverselyrounded surfaces 8, 8, of the inside of the bows 9, 9, of scissorsblades 10, 10. A. swing stop 11 is pivoted to a suitable support, 12, asat 18, and is adapted to normally swing close to the end of the arm 5,for 111- stance under the influence of a weight, as 14,

' so as to keep the articles upon the arm from flying off its ends.Another stop, as 15, is placed in such a position that it will arrestthe articles upon the arm 5 if they tend to swing forward and upwardaround the arm.

In l ig. 3 I have shown a modification wherein a stop 16, preferablyswinging upon a hinge 17, or otherwise yieldably operable, is placed soas to intercept the upward swing of such an article as a ring 18,causing it to fall back instead of progressively swinging around thearm. This stop 16 may have a padded end, as 19, or the stop itself maybe made of leather or similar material, its duty being to arrest theswing of the article 18 without injuring its outer surface. In operation, the stop 11 is swung, out and the scissors blades are slippedonto the arm 5, which is rapidly revolved by the shaft 1. The stop 11 isthen allowed to fall into place at the end of the arm 5. The rapidrevolution of the eccentrically held arm 5 *auses it to toss or drivethe scissors bows away from it, only to be instantly met by it atanother point in its orbit of rotation; and the continuation of theseblow-like contacts, in a remarkably short period of time, will flattendown and remove the bur or other excrescences 011 the inner curves ofthe bows, smoothing them down to a uniform surface. or causing them toscale ofi'.

In the drawings it has been assumed that the shaft 1 is to rotateclockwise, and the stops 15, 16, have been located with thatIIIOVEIIlQlll? in view.

These stops should be adjusted so as to properly control the particularclass of articles which are being polished at any time. And havingpointed this out I deem it to be unnecessary to give furtherillustrations. When the smoothing process has progressed sufficiently,the stop 11 is swung out, the articles are drawn off the arm 5, anotherset are slipped on the arm, and the stop is again dropped into place. Inpractice all this can be done without stopping the shaft 1. I wish it tobe understood that the apparatus shown and described is used. as anillustrative type of mechanism embodying my invention, and that I do notlimit myself to the precise form or type of mechanism shown, as thesemay be varied by one skilled in the art by the use of mechanicalequivalents or the like without departing from the spirit of myinvention as claimed.

Having thus described my invention, what I claim and desire to secure byLetters Patent of the United States is 1.111 a machine for smoothinginterior surfaces, rotatable means, unitary supportingand smoothingmeans carried'by the rotatable means and eccentrically disposed relativeto the center of rotation. I

2. In a machine for smoothing interior surfaces, rotatable means,unitary supporting and smoothing means consisting of an al'm carriedbythe rotatable means and cocentrically disposed relative to the centerof rotation.

3. In a machine for smoothing interior surfaces, rotatable means,smoothingmeans consisting of an arm having a series of circumferentialgrooves carried by the rotatable'means and eccentrically disposedrelative to the center of rotation.

l. In a machine for smoothing interior surfacesprotatable means,supporting and smoothing meansdetachably carried by the rotatable meansin fixed relation thereto and eccentrically disposed relative to'thecenter of rotation.

5. In a machine for smoothing interior surfaces, rapidly rotatablemeans, and unitary means carried thereby adapted to support freely acircumferentially closed article and, When rotated, to operate againstthe innor surface of such article with a succession of rapid contacts.

6. In a machine for smoothing interior surfaces, rapidly rotatablemeans, and unitary means carried eccentrically thereby adapted tosupport freely a circumferentially closed article and, When rotated, tooperate against the inner surface of such article with a succession ofrapid contacts.

7. In a machine for smoothing interior surfaces, shaft rotating means, ashaft, a chuck carried thereby, an arm held eccentrically by said chuck,and a movable stop adjacent to the free end of the arm.

8. In a machine for smoothing interior surfaces, shaft rotating means, ashaft, a chuck carried thereby,an arm held eccentrically by said chuck,a movable stop adjacent to the free end of the arm, and an antirotatio'nelement to prevent the rotation of an article carried by said arm.

9. Ina machine for smoothing interior surfaces, shaft rotating means, ashaft, a chuck carried thereby, an arm having circumferential variationheld eccentrically by said chuck, and a movable stop adjacent to thefree end of the arm.

FREDERIC H. RAUH.

Witness:

AGNES SCI-IAEFER.

